Show HN: RAG Firewall – retrieval-time guardrails for LangChain/LlamaIndex

RAG pipelines are great, but they can still retrieve "toxic" chunks: – prompt injection attempts – leaked API keys/secrets – stale or conflicting content – unapproved external URLs

We built an open-source "retrieval firewall" that scans chunks before they reach the LLM: – denies injection & secrets – flags/reranks PII, encoded blobs, untrusted URLs – audit log (JSONL) of all decisions – drop-in wrappers for LangChain and LlamaIndex retrievers

Install: pip install rag-firewall Repo: https://github.com/taladari/rag-firewall

Curious if others here handle retrieval-time risks, or just ingest/output filtering. Would love feedback and red-team payloads.